Joseph j



J. J. HARRELL. WOOD PULP MAKING MACHINE.

No. 592,090. PatentedOct. 19,1897.

(No Model.) 2 Sheets-Sheet 2.

J.'J. HARRELL. WOOD PULP MAKING MACHINE.

No. 592,090. I Patented O0t.19, 1897.

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UNITED STATES I PATENT OFFICE.

JOSEPH J. HARRELL, OFIQHI OAGO, ILLINOIS, ASSIGNOR OF THREE-FOURTHS TOCHARLES HQABBOTT AND W ILLIAM WQ'HESSEY, OF DENVER, COLO- RADO.

:w ooDr'PuLP-MA rNe MACHINE.

srncrrrcA'rio vir m part of Letters Patent No. 592,090, dated October19, 1897.

' Application filed llecemher re, 1896. s rain). 615,6 74.. (N0 model.)

To all whom it concern: f

Be it known that I, JOSEPH J. HARRELL, a citizen of the United States,residingat Ohicago, in the county of Cook and State of Illi- 'nois, haveinventedcertain' new and useful Improvements in Wood-'Pulp Making Ma'-chines; and I do declare the following to be a plication for LettersPatent filed July 9, 1896,

Serial No.,598,544.

The objects of the invention are, to provide for the reduction of thematerial from the block form to the chip form in connection with thepulverizing mechanism; to better provide for the agitation of the pulpwithin the reducing-chamber,'and to prevent the clogging of thedischarging-screen.

With these objects in view it consists in so constructing and arrangingthe machine that it is provided with a cutting or chipping device at themouth of a hopper adapted to receive the material in'block form, andwhich feeds the reducing-mill; in so forming the inclosing case that itis provided with a large chamber above the heaters into which the pulpisthrown from the beaters by centrifugal action, the wall of thischamber against which the pulp is so discharged being so curved that thematerial is thrown forwardly, so that it may descend by the action ofgravity among the beater-arms, and in so forming the ribs or bars of thedischarging-screen that the agitation of the pulp will tend to dislodgefrom the, screen-aperture any large particles which may gather therein.

In the drawings, Figure 1 is a front elevation of the machine. Fig. 2 isa transverse vertical section thereof upon the line 2 2 of Fig. Fig. 3is a longitudinal vertical section upon the line 3 3 of Fig. 2.

' The shell or casing of the machine A is oblong rectangular' in itsgeneral contour, and is horizontally divided into two sections, thelower one a forming the bottom of the casing, and being apertured toreceive the discharging-screen, which is curved in form, the arc ofcurvature having the axis of the beatershaft as its center. This shaft 0is j ournaled longitudinally within the casing A, and upon it aremounted a plurality of disks D, having radiating arms d, as shown, eightin number. These disks are spaced apart by means of rings F, which,together with the disks, are keyed upon the shaft. The disks D are soset upon the shaft that the beater-blades d are arranged in spiral form,the spiral running from the middle of the, machine to its sides, in onedirection taking the form of a right screw-thread and in the other aleft screw-thread, so that as the heaters revolve they tend to move thepulp continuously toward the sides of the machine. A plurality of bladesE are fixed in one of the side walls of the casing A and projectinwardly, intermeshing with the beater-blades and terminating beyondtheir bases, the inner ends of these blades being thickened, asindicated at 6, so as to bear against the surface of adjacent disks D.The blades E. are held in this machine in the same manner as in theearlier machine above referred to, being set within a recess formedbetween the attaching-flanges of the upper and lower sections of thecasing, and being looked in place by means of a rib a engagingtransverse notches in the blades, the blades being spaced apart by theintroduction of suitable blocks 6.

The screen consists of the two slotted plates G H, the former being theinner one, being in fixed relation with the bottom a of the casing, andthe outer one being adapted to slide upon its companion, and being heldin frictional contact therewith-by means of the curved bars J, pivotedat j to one side of the bottom a of the casing and secured by means ofbolts 3' to the other side thereof, the

outer ends of the bars J being united by means of the plates J. Theinner faces of the bars of the screen G are beveled, so as to present aninclined face to the pulp as it is carried forward by the action of theheaters, so that the inner face of the screen presents the appearance ofa series of grooves having an abrupt and an inclined wall, therebyforming an abutment over which the pulp is precipitated, and preventingslivers of wood from being driven into the interstices of the screen,and allowing any particles which may seek lodgement therein to bequickly washed out by the agitation of the material.

The adjustment of the screen, as in the case of my earlier machine, isaccomplished by means of a crank-handle K, fixed upon a rock-shaft 7t,journaled within the bars J and having fingers k engaging suitablesockets in the bands k secured to the outer plate H of the screen.

The casing A extends upwardly above the heaters, so as to form asuitable chamber into which the pulp is discharged from the heaters bycentrifugal action. That wall of the casing along which the pulp is thusdischarged is curved inwardly at its upper end, as indicated at a, sothat the pulp is thrown forwardly and descends upon the heaters by theaction of gravity. By this means I am able to return the pulp to theinner portions of the heaters, the centrifugal action tending at alltimes to carry it to their outer ends. A casing 13, of less length thanthe casing A, is superimposed upon the latter and is secured thereto bythe hinge B at one side and by bolts B at the other side. YVithin thecasing 13 the top of the casiir A is apertured to receive the material,and an apron L extends from one side of this aperture obliquelydownwardly, so as to receive the impact of the pulp, then upwardly fromthe heaters, and terminates a sufficient distance from the side wall ofthe casing A to permit the entry of fresh material. The top of thecasing Bis open, serving as the mouth of a hopper, which consists inpart of the walls of the casing and in part of a swinging plate Z),pivoted within the casin g and supported by a screw-threaded rod 1),projecting through the casing-wall and being provided with a hand-wheel.3etwcen the mouth of the hopper thus formed and the apron L is journaleda horizontal cylinder M, carrying the cutting-blades m m. The wood to beoperated upon is introduced into the hopper in the form of blocks X,which fall upon the face of the cylinder M, so that the cutting-bladesgradually reduce them by chipping, the chips being carried downwardlyand delivered into the reducingchamber. A horizontal pipe Z extendslongitudinally through the casing immediately below the cylinder M andis provided throughout its length with small discharge apertures, bywhich means a suitable quantity of water may be delivered to the machinewith the chips. The cylinder M is driven from the shaft C by means of abelt 0 upon suitable pulleys upon this shaft and the shaft of thecylinder. A helt-tightener in the form of an idle-pulley P cooperateswith the belt, being suitably journaled in the arms 1) p, projectingfrom a sleeve Q, mounted upon a shaft q, secured in brackets attached toone of the sides of the casing A. The sleeve Q is controlled by ahandle-bar R and is locked in an advanced position by means of aratchet-wheel r and a pawl S. By this means a loose belt may beemployed, so that when desired the cuttingcylindcr M may be stoppedwithout interfering with the action of the heaters, so that if the chipsare fed to the pulverizer too rapidly the clogging of the machine may beprevented.

The upper edges of the blades E are inclined, as shown in Fig. 2,downwardly from the wall of the casing, so that by impact of the chipsupon these blades they are thrown toward the center of thebeater-cylinder and prevented while in this larger form from beingthrown directly against the screen. After the material has become finelysubdivided, this incline form of the upper edge of the blades ceases ingreat measure to divert them to the center, so that the effect of thusforming the plate is measurably to assort the coarser from the finermaterial, leaving the latter free to seek by the centrifugal action toescape through the screen. Near their inner ends the top edges of theblades are given an upward inclination, so as to prevent the materialfrom being carried too far to the center and into the space between thedisks D.

The plate I), forming one of the walls of the hopper, is mounted upon apivot, as shown, so that the capacity of the hopper may be varied toadapt the machine to the character of material being operated upon.Should the material be hard and require a longer time for reduction, itis obvious that the feed should be slower, and this is secured byadvancing the plate Z) so as to contract the throat of the hopper andthereby reduce the number of blocks in contact with the cutting-blades,and consequently the quantity of chips delivered to thepulverizing-chamher. When wood is used, which is more readily reduced,the plate Z) may be moved backwardly, permitting a greater number ofblocks to come into contact with the blades, and thus incrcasin g thequantity of chips produced.

1. In a wood-pulp mill the combination with a plurality of heatersmounted upon a horizontal shaft, a case for inclosing such beaters, andhaving an enlarged chamber above the heaters to receive the pulp thrownthere from by centrifugal action, the roof of such chamber being curvedto direct the pulp forward in the direct-ion of rotation of the heaters.

2. lnawood-pulp mill the combination with In testimony whereof I aflixmy signature a plurality of rotatable heaters, and a casing in presenceof two Witnesses.

for inclosing such heaters of a slotted discharge-screen, the bars ofwhich have their JOSEPH HARRELL' 5 inner faces beveled outwardly in thedirecl/Vitnessesz tion oppositely t0 the direction of rotation of LOUISK. GILLSON,

the heaters. SAKE D. THOMPSON.

